The 2004 and 2007 enlargements pushed the EU's external border further east as well as closer to unstable areas in the western Balkans. With future enlargements unlikely in the short-term, the EU faces new challenges in securing stable relationships with these neighbouring countries, while not fostering false hopes of early accession. This book explores the challenges facing the EU in developing its relations with neighboring countries in Eastern and South-Eastern Europe following the enlargements of 2004 and 2007.